The Consilium was the body responsible for carrying out the post-Vatican II liturgical reforms according to Sacrosanctum Concilium, the conciliar constitution on the liturgy. It was split into various different coetus (groups), each responsible for a different part of the reforms. Coetus IX were assigned to the reform of the Roman Breviary (Breviarium Romanum), also known as the Divine Office (Divinum Officium). This volume, Schema 322, was one of only a few schemata that were published in very small quantities (in this case, probably around 800 copies) for the purpose of wider consultation with various liturgical, theological and pastoral periti ("experts").